Pneumatic Flange Type Smoke Ventilation Butterfly Valve D641W/D641H

D641W/D641H pneumatic flange smoke ventilation butterfly valve is a non enclosed butterfly valve widely used in production processes such as building materials, metallurgy, mining, and power, to connect, open and close, or regulate the medium quality. The pneumatic ventilation butterfly valve is designed and manufactured using a new structural form of welding a centerline type disc plate with a short structural steel plate. It has a compact structure, light weight, easy installation, low flow resistance, and large flow capacity, avoiding the influence of high temperature expansion, and is easy to operate. No connecting rods, bolts, etc. inside the body, reliable operation, and long service life. It can be installed at multiple workstations without being affected by the flow direction of the medium.

Application field:
Widely used in textile, chemical, petroleum, incineration plants, cremation plants, thermal power plants, machine room ventilation, medicine, food, shipbuilding, steel smelting, papermaking, biotechnology, chemical fields and other places.

Execution standards:
Design standard: GB/T12238-1989 JB/T8692-1998
Flange connection size: GB/T9115.1-2000
Structural length h: GB/T12221-1989
Pressure test: GB/T13927-1992; JB/T9092-1999

Performance parameters of the actuator
Adopting a new type of pneumatic actuator, there are double acting and single acting (spring return), gear transmission, safe and reliable; The large-diameter valve adopts a series of AW pneumatic actuators with a fork type transmission, with a reasonable structure and large output torque, available in double acting and single acting types.

1. Gear type dual piston, with large output torque and small volume.
2. The cylinder is made of aluminum material, which is lightweight and has a beautiful appearance.
3. Manual operating mechanisms can be installed at the top and bottom.
4. The rack and pinion connection can adjust the opening angle and rated flow rate.
5. The actuator can be equipped with live signal feedback indication and various accessories to achieve automated operation.
6. The IS05211 standard connection provides convenience for product installation and replacement.
7. The adjustable screws at both ends allow standard products to have an adjustable range of ± 4°between 0°and 90°.Ensure synchronization accuracy with the valve.

Performance parameter:

Main parts material:

Main external structure size:

Installation precautions:

1. Before installation, the specifications, pressure, temperature, and corrosion resistance of the butterfly valve should be checked to ensure that they meet the requirements for use. Each component should be checked for damage or looseness.
2. This butterfly valve can be installed on pipelines at any angle and should be closed for installation; When welding pipeline flanges, the valve sealing port should be blocked with a plate to prevent particles and debris from damaging the sealing surface. After welding, remove the valve, clean the valve sealing surface and pipeline cavity, and then install and fix the valve.
3. Please pay attention to the pressure direction when installing when the valve is closed.
4. Before installation, the sealing surfaces (sealing surfaces at both ends, butterfly plate sealing surfaces, and valve seat sealing surfaces) should be thoroughly wiped clean to remove dust and dirt.
5. Before installation, the butterfly valve should be air tested, with flexible opening and closing, and the opening and closing positions should match the indicated positions of the pointer.
6. Manually operate clockwise to close and counterclockwise to open. Do not apply force to open or close the valve after the pointer indicates it is in place.
7. When conducting pressure tests on valves, it is not allowed to use a single flange for installation and pressure testing. Double flange installation and pressure testing must be used. The test pressure should comply with the provisions of GB/T13927-92 standard.
8. When tightening bolts, they should be tightened symmetrically and alternately, and individual tightening in sequence is not allowed.
9. The limit screw has been adjusted before leaving the factory and should not be easily adjusted. If the drive device is configured as electric or pneumatic, please refer to the accompanying drive device manual.
10. The opening and closing stroke of the control mechanism has been adjusted when the electric butterfly valve leaves the factory. To prevent incorrect direction when the power is turned on, the user should manually turn it on to the half open position before the first power connection, then press the jog switch, and check that the direction of the indicator panel is consistent with the direction of the valve opening.
11. If the valve is found to have abnormal opening and closing, the cause should be identified for repair and elimination to prevent damage to the valve caused by using force to open and close the valve.